diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index 6d0fe92c..e014a7ce 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -389,10 +389,11 @@ export class ProblemFilesHandler extends ProblemDetailHandler {
         this.response.body.links = links;
     }
 
-    @post('filename', Types.Name)
-    @post('type', Types.Content, true)
+    @post('filename', Types.Name, true)
+    @post('type', Types.Range(['testdata', 'additional_file']), true)
     async postUploadFile(domainId: string, filename: string, type = 'testdata') {
         if (!this.request.files.file) throw new ValidationError('file');
+        if (!filename) filename = this.request.files.file.name || String.random(16);
         if (this.pdoc.owner !== this.user._id) this.checkPerm(PERM.PERM_EDIT_PROBLEM);
         if (filename.endsWith('.zip')) {
             const zip = new AdmZip(this.request.files.file.path);
diff --git a/packages/hydrooj/src/lib/testdataConfig.ts b/packages/hydrooj/src/lib/testdataConfig.ts
index 4c2f6655..d00aad1f 100644
--- a/packages/hydrooj/src/lib/testdataConfig.ts
+++ b/packages/hydrooj/src/lib/testdataConfig.ts
@@ -21,8 +21,8 @@ export async function parseConfig(config: string | ProblemConfig = {}) {
     let cfg: ProblemConfig = {};
     if (typeof config === 'string' && config.length) {
         // TODO should validate here?
-        cfg = await readYamlCases(load(config) as Record<string, any>) as ProblemConfig;
-    } else if (typeof config === 'object') cfg = config;
+        cfg = await readYamlCases(load(config) as Record<string, any>);
+    } else if (typeof config === 'object') cfg = await readYamlCases(config);
     if (cfg.subtasks.length) {
         for (const subtask of cfg.subtasks) {
             result.memoryMax = Math.max(result.memoryMax, subtask.memory);
diff --git a/packages/ui-default/components/cmeditor/index.js b/packages/ui-default/components/cmeditor/index.js
index 7f935684..f72990ac 100644
--- a/packages/ui-default/components/cmeditor/index.js
+++ b/packages/ui-default/components/cmeditor/index.js
@@ -5,8 +5,8 @@ export const config = {
   toolbar: [
     'emoji', 'headings', 'bold', 'italic', 'strike', 'link', '|',
     'list', 'ordered-list', 'check', 'outdent', 'indent', '|',
-    'quote', 'line', 'code', 'inline-code', '|',
-    'upload', 'record', 'table', '|',
+    'quote', 'line', 'code', 'inline-code', 'table', '|',
+    'upload', 'record', '|',
     'edit-mode', 'content-theme', 'code-theme', 'export', 'preview',
   ],
   mode: 'ir',
@@ -38,20 +38,11 @@ export default class CmEditor extends DOMAttachedObject {
     await new Promise((resolve) => {
       this.editor = new Vditor(ele, {
         ...config,
+        ...this.options,
         after: resolve,
         input(v) { $dom.text(v); },
         value,
         cache: { id: Math.random().toString() },
-        upload: {
-          accept: 'image/*,.mp3, .wav, .zip',
-          url: '/api/upload/editor',
-          linkToImgUrl: '/api/upload/fetch',
-          filename(name) {
-            return name.replace(/[^(a-zA-Z0-9\u4e00-\u9fa5.)]/g, '')
-              .replace(/[?\\/:|<>*[\]()$%{}@~]/g, '')
-              .replace('/\\s/g', '');
-          },
-        },
       });
     });
     $(ele).addClass('textbox');
@@ -71,10 +62,6 @@ export default class CmEditor extends DOMAttachedObject {
     return ret;
   }
 
-  destory() {
-    this.editor.destory();
-  }
-
   focus() {
     this.ensureValid();
     this.editor.focus();
diff --git a/packages/ui-default/pages/problem_edit.page.js b/packages/ui-default/pages/problem_edit.page.js
index 04ad9511..fce4280a 100644
--- a/packages/ui-default/pages/problem_edit.page.js
+++ b/packages/ui-default/pages/problem_edit.page.js
@@ -5,6 +5,7 @@ import tpl from 'vj/utils/tpl';
 import i18n from 'vj/utils/i18n';
 import { ConfirmDialog } from 'vj/components/dialog';
 import Dropdown from 'vj/components/dropdown/Dropdown';
+import CmEditor from 'vj/components/cmeditor/index';
 
 const categories = {};
 const dirtyCategories = [];
@@ -141,7 +142,7 @@ function buildCategoryFilter() {
   });
 }
 
-export default new NamedPage(['problem_create', 'problem_edit'], () => {
+export default new NamedPage(['problem_create', 'problem_edit'], (pagename) => {
   $(document).on('click', '[name="problem-sidebar__show-category"]', (ev) => {
     $(ev.currentTarget).hide();
     $('[name="problem-sidebar__categories"]').show();
@@ -169,4 +170,57 @@ export default new NamedPage(['problem_create', 'problem_edit'], () => {
   $(document).on('change', '[name="tag"]', parseCategorySelection);
   buildCategoryFilter();
   parseCategorySelection();
+
+  setInterval(() => {
+    $('img').each(function () {
+      if (this.src.startsWith('file://')) this.setAttribute('src', this.src.replace('file://', './file/'));
+    });
+  }, 50);
+
+  CmEditor.getOrConstruct($('textarea[data-markdown-upload]'), {
+    upload: {
+      accept: 'image/*,.mp3, .wav, .zip',
+      url: './files',
+      extraData: {
+        type: 'additional_file',
+        operation: 'upload_file',
+      },
+      multiple: false,
+      fieldName: 'file',
+      setHeaders() {
+        return { accept: 'application/json' };
+      },
+      format(files, resp) {
+        const res = JSON.parse(resp);
+        if (res.error) {
+          return JSON.stringify({
+            msg: res.error.message,
+            code: -1,
+            data: {
+              errFiles: [files[0].name],
+              succMap: {},
+            },
+          });
+        }
+        return JSON.stringify({
+          msg: '',
+          code: 0,
+          data: {
+            errFiles: [],
+            succMap: {
+              [files[0].name]: `file://${files[0].name.replace(/[^(a-zA-Z0-9\u4e00-\u9fa5.)]/g, '')
+                .replace(/[?\\/:|<>*[\]()$%{}@~]/g, '')
+                .replace('/\\s/g', '')}`,
+            },
+          },
+        });
+      },
+      filename(name) {
+        return name.replace(/[^(a-zA-Z0-9\u4e00-\u9fa5.)]/g, '')
+          .replace(/[?\\/:|<>*[\]()$%{}@~]/g, '')
+          .replace('/\\s/g', '');
+      },
+      validate: () => (pagename === 'problem_create' ? i18n('Cannot upload file before problem is created.') : true),
+    },
+  });
 });
diff --git a/packages/ui-default/templates/problem_edit.html b/packages/ui-default/templates/problem_edit.html
index 3e94d976..f9c91d03 100644
--- a/packages/ui-default/templates/problem_edit.html
+++ b/packages/ui-default/templates/problem_edit.html
@@ -40,7 +40,7 @@
           <div class="row"><div class="columns">
             <label>
               {{ _('Content') }}
-              <textarea name="content" class="textbox" data-markdown style="height: 500px">{% if pdoc %}{{ pdoc['content']|toString }}{% else %}{% include 'partials/problem_default.md' %}{% endif %}</textarea>
+              <textarea name="content" class="textbox" data-markdown-upload style="height: 500px">{% if pdoc %}{{ pdoc['content']|toString }}{% else %}{% include 'partials/problem_default.md' %}{% endif %}</textarea>
             </label>
           </div></div>
           <div class="row"><div class="columns">